The Influence of Bearing Stiffness on Reduction of Vibration of Floating Slab Track

Abstract

The most important component in the floating slab track (FST) system is the elastic bearing system natural rubber synthetic rubber or metal springs are usually used and the material of the elastic bearing needs to have the characteristic of high service life and high resistance to fatigue and aging If the elastic bearing of the FST adopt natural or synthetic rubber it will cause fatigue and aging of the rubber bearing under the repeated load of the dynamic train load during long-term operation It will cause fatigue and aging of the rubber and the vertical stiffness of the rubber bearing will increase which will affect the reduction effect of the FST In this research the commercial finite element software Abaqus/CAE will be used to build a three-dimensional finite element model of the FST which is based on the design diagram of the extension line of the Taoyuan Airport MRT The model will be verified by literature and the on-site hammer test After verifying the FST model the influence on reduction effect of the FST will be discussed under different circumstances of fatigue and aging of the rubber bearing when the train model pass through the FST By analyzing the insertion loss spectrum and the overall insertion loss of the FST we see that the insertion loss spectrum curve of the FST has a trend to move upward and the overall insertion loss of the FST decrease as the rubber ages and the bearing stiffness increase This means that as the rubber ages the bearing stiffness increase the reduction effect of the FST decrease which will cause the vibration amount of the tunnel invert and the outside-surface increase and the environmental vibration will increase too

Date of Award	2020
Original language	English
Supervisor	Chen-Ming Kuo (Supervisor)